Mineral feed and process of making same



Prensa M... 7,1929

UNITED STATES PATENT OFFICE.

VIBGIL B. BUPP, NEW YORK, H. Y.

MINERAL FEED PROCESS OF MAKING BAKE.

' Io Drawing.

This invention relates to a mineral feed and a process of preparing same. I r A useful ingredient in such a mineral feed is sodium sulfate, commonly called salt cake. A common method of preparin this salt cake is to treat common salt or so ium' chloride with sulphuric acid in suflicient,quantities in order 'to produce the following reactions.

uac1+H,so,=-NaHso,+Hc1 NaHSO,+Na-CI Na SO;+I-ICI The reaction inEquation 1 occurs readily when mixing the two ingredients, the hydrochloric acid passing oii as a gas, while the sodium bissulfate remains. The second reaction indicated in Equation 2 occurs only on the application of considerable heat and as a consequence the sodium sulfate salt sells at a considerably higher price than the bi-sulfate or the acid sodium sulfate, commonlycalled nitre cake.

Rock phosphate contains a quantity of fluorine which-if taken internally would be injurious to the animals or oultry. In order to reduce the quantity of uorine contained in the raw rock phosphate, the phosphate is treated with sul huric acid whereby a greater proportion of t e fluorine is driven off and the rock phosphate is converted into an acid phosphate which is soluble in water and, therefore, more suitable to feed-the animals.

Application flied. January 27, 1828. Serial 1 |'o. 250,001.

An object of the present. invention is to provide a mineral food which has not only a reduced ercentage of the normal quantity of fluorine 1n the rock phosphate, but to .provide a binder of calcium sulfate and to reduce the number of stepsin the removal of the fluorine and also for the formation of the calcium sulfate.

A further object of the invention the rovision of a process for formin an acid p osphate from a sodium. acid sul ate simultaneously with the binder such as calcium sulfate, and in which the fluorine content of the rock phosphate is reduced from more than three per cent by weight in certainsamples of raw rock phosphate, to less than one per cent on the basis of the phosphate present in the in- Eredien-ts in a heated mixture, as described elow.

In carrying heatin toget er sodium acid sulfate and so- ..dium c loride to form salt cake, and heating rock phosphate with sulphuric acid to remove fluorine and make the phosphate more solout my invention instead of uble, I combine these two processes to obtainapproximately the same results. Instead of heating the sodium bi-sulfate with common salt as disclosed in the second equation of the preparation of the salt cake, the rock hosphate is heated with the sodium bi-su fate. The action may be represented by the following equation.

Thus, in heating the fluorine, which is not taken into consideration in the equation, is eliminated and part of the rock phosphate is rendered soluble in water. It. will also be noted, that one of the products, calcium. sulphate, is obtained simultaneously with the acid phosphate, and this is employed as a binder during the manufacture. of the materialsin ellet form.

A particular example in carrying out my process is as follows;

.One part of rock phosphate is lntlmatel mixed with two parts of he sodium bi-su fate. This mixture is then heated in a rotary kiln or a kiln similar to thekind used in reparing salt cake, or the mixture may. be eated in any type of furnace suitable for the pur A temperature preferably of 300 C. 1s maintainedto rovide for the melt ing of the sodium bi-sul ate, and for the elimination of fluorine, although fluorine gas siderable of its coherent properties so that y when it is mixed with other mineral elements, about to be described. it will not so well maintain a state of division in pellet form and is inclined to be reduced to a owder unless some other adhesive is em loy After the heating h as been'maintained for l a predeterminedtime, theymixture is then cooled and preferably ground and mixed in the following proportions with certain other mineral elements.

Parts.

Nitre cake rock phosphate mixture 50 Limestone 20 Charcoal 20 Common salt 10 able'manner into small particles or pellet like form, the size of the particles or pellets, of course, being varied to suit the particular needs for which themineral food is adapted to be employed. In'making a mineral food for hogs, strings of the pasty mass are cut into sizes approximating a grain of corn."

The pellet like form produced from the paste are particularlyefficacious, due to the fact that they are maintained in granular form for in such condition they will not be readily blown away when placed in an animal feeder and, furthermore, they notonly present a better appearance, but are more easily ,handled. In'the present-process the single .step of heating the sodium bi-sulfate with rock phosphate eliminates in one operation,

the greater per cent of the fluorine contained in the rock phosphate, while not only rendering the phosphate more available as a food but providing simultaneously a binder in the form of calcium sulfatef 1. The process of preparing a mineral food which consists of heating together an acid sulfate and rock phosphate. 2. A process of preparing a mineral food which consists in heating an intimate'mix- .ture of acid sulfate and rock phosphate, and

converting the rock phosphate and the acid sulfate into an acid calcium sulfate.

3. A process of preparing a mineral food which comprises heating a mixture of acid sulfate and rock phosphate to a temperature above 300 C., cooling the mixture of the compounds thus formed and adding additional mineral matter.

4'. A process of preparing a mineral food which comprises heating a mixture of acid sulfate and rock phosphate to a temperature above 300 C., cooling the mixture of the compounds thus formed and adding other mineral matter and water in sufficient quantity to form a semi-pasty mass, dividing the mass into particles anddrying the separate particles.

phosphate and a binder of 5. A process of preparin a mineral food mixture of the compound thus formed and in timately mixing with the cooled mixture, water, limestone, charcoal and salt to form a aste.

A process of preparing a mineral food which comprises heating rock phosphate having a fluorine content, with bi-sulfate of soda to form a binder in the form of calcium sulfate, and an acid calcium phosphate, while at the same time driving off the fluorine content of the rock phosphate.

8. A mineral food comprising a binder such as calcium sulfate and an acid calcium phosphate formed from rock phosphate and an acid sulfate, said food also including limestone, charcoal and salt.

Signed at New York in the county of New York and State ofNew York this 20th day of January, A. D. nineteen hundred and twentyeight.

- f VIRGIL R. RUPP. 

